Question Details

(Solved) I need help with discussion questions for this Case Study (


please show work for each question. it is a total of 10 stats problems. I don't understand how to do any of them. these are the ones I need help with !


SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

 

Use the given degree of confidence and sample data to find a confidence interval for the population

 

standard deviation ?.

 

Assume that the population has a normal distribution. Round the confidence interval limits to one more

 

decimal place

 

than is used for the original set of data.

 

1) The football coach randomly selected ten players and timed how long each player took to perform a

 

certain

 

drill. The times (in minutes) were:

 

11 8 8 10 11

 

9 9 14 8 5

 

Find a 95% confidence interval for the population standard deviation ?.

 

Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null

 

hypothesis, and final

 

conclusion that addresses the original claim.

 

2) A supplier of digital memory cards claims that no more than 1% of the cards are defective. In a

 

random sample

 

of 600 memory cards, it is found that 3% are defective, but the supplier claims that this is only a sample

 

fluctuation. At the 0.01 level of significance, test the supplier's claim that no more than 1% are defective.

 

Solve the problem.

 

3) A manufacturer finds that in a random sample of 100 of its CD players, 96% have no defects. The

 

manufacturer

 

wishes to make a claim about the percentage of nondefective CD players and is prepared to exaggerate.

 

What is

 

the highest rate of nondefective CD players that the manufacturer could claim under the following

 

condition?

 

His claim would not be rejected at the 0.05 significance level if this sample data were used. Assume that

 

a

 

left-tailed hypothesis test would be performed.

 


 

Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null

 

hypothesis, and final

 

conclusion that addresses the original claim.

 

4) The health of employees is monitored by periodically weighing them in. A sample of 54 employees has

 

a mean

 

weight of 183.9 lb. Assuming that ? is known to be 121.2 lb, use a 0.10 significance level to test the claim

 

that the

 

population mean of all such employees weights is less than 200 lb.

 

Test the given claim. Use the P-value method or the traditional method as indicated. Identify the null

 

hypothesis,

 


 

alternative hypothesis, test statistic, critical value(s) or P-value, conclusion about the null hypothesis, and

 

final

 

conclusion that addresses the original claim.

 

5))A simple random sample of 15-year old boys from one city is obtained and their

 

weights (in pounds) are listed below. Use a 0.01 significance level to test the claim that these sample

 

weights

 

come from a population with a mean equal to 149 lb. Assume that the standard deviation of the weights

 

of all

 

15-year old boys in the city is known to be 16.2 lb. Use the traditional method of testing hypotheses.

 

147 138 162 151 134 189 157 144 175 127 164

 

Assume that a simple random sample has been selected from a normally distributed population and test

 

the given claim.

 

Use either the traditional method or P-value method as indicated. Identify the null and alternative

 

hypotheses, test

 

statistic, critical value(s) or P-value (or range of P-values) as appropriate, and state the final conclusion

 

that addresses the

 

original claim.

 

6) A cereal company claims that the mean weight of the cereal in its packets is 14 oz. The weights (in

 

ounces) of

 

the cereal in a random sample of 8 of its cereal packets are listed below.

 

14.6 13.8 14.1 13.7 14.0 14.4 13.6 14.2

 

Test the claim at the 0.01 significance level.

 


 

Assume that a simple random sample has been selected from a normally distributed population. Find

 

the test statistic,

 

P-value, critical value(s), and state the final conclusion.

 

7) Test the claim that the mean lifetime of car engines of a particular type is greater

 

than 220,000 miles. Sample data are summarized as n = 23, x = 226,450 miles, and s = 11,500 miles. Use

 

a

 

significance level of ? = 0.01.

 

2

 

Find the critical value or values of x^2 based on the given information.

 

8) H1: ? < 0.14

 

n = 23

 

? = 0.10

 

Assume that the data has a normal distribution and the number of observations is greater than fifty. Find

 

the critical z

 

value used to test a null hypothesis.

 

9) ? = 0.08; H1 is ? ? 3.24

 


 

Solve the problem.

 

10) A simple random sample of students is selected, and the students are asked how much time they

 

spent

 

preparing for a test. The times (in hours) are as follows:

 

1.3 7.2 4.2 12.5 6.6 2.5 5.5

 

Based on these results, a confidence interval for the population mean is found to be ? = 5.7 ± 4.4. Find

 

the degree

 

of confidence.

 


 

 


Solution details:

Pay using PayPal (No PayPal account Required) or your credit card . All your purchases are securely protected by .
SiteLock

About this Question

STATUS

Answered

QUALITY

Approved

DATE ANSWERED

Oct 15, 2019

EXPERT

Tutor

ANSWER RATING

YES, THIS IS LEGAL

We have top-notch tutors who can do your essay/homework for you at a reasonable cost and then you can simply use that essay as a template to build your own arguments.

You can also use these solutions:

  • As a reference for in-depth understanding of the subject.
  • As a source of ideas / reasoning for your own research (if properly referenced)
  • For editing and paraphrasing (check your institution's definition of plagiarism and recommended paraphrase).
This we believe is a better way of understanding a problem and makes use of the efficiency of time of the student.

NEW ASSIGNMENT HELP?

Order New Solution. Quick Turnaround

Click on the button below in order to Order for a New, Original and High-Quality Essay Solutions. New orders are original solutions and precise to your writing instruction requirements. Place a New Order using the button below.

WE GUARANTEE, THAT YOUR PAPER WILL BE WRITTEN FROM SCRATCH AND WITHIN A DEADLINE.

Order Now